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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6de59d31a4cf019bd1ef9aa37aa7899681c6f28f6ff681ce7f1f434adb5c0ea5' 
  AND token = '5ra1Y6SQTf706WNqYJC93Jkx4V51w132kaN5HqLPBKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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