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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73b79ce162ee8902ca127670d25e1ac399d1eb301c209484a95b4697e368ecd8' 
  AND token = 'O9YJMllWBE7Bh9aiJUmvv4NxAKETuka5QEvTBaAYUyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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