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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d522aa86d215de33cd8b612ce817f08214d831da050f436d8f8f78dfef31859' 
  AND token = 'fV8MurP01i2ovv5UnVKThxVoPUFylcUY/hUkuAwptD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}