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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '723a6f1185a4affb634e7acf1df4168d6315dd3d73ac905321dac1b3e4b98943' 
  AND token = 'UtdqM1Y+bMMRQWonW6QQTUCquMx9u3S4F4d6zOL2YRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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