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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd501cc9f311aef66a8e519de76834c517510c6f5e1f50c06cac4e8ae0fe0b6c6' 
  AND token = 'dS8st74iF8PW+tvN3FLTwgrSSZHVkXGuva+QBmwJP0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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