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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54808a05ea862ee39bfb28d40c4fe9451b0f0c3fd38f4c54e96ef96fbfe378c3' 
  AND token = '6SNp1mGO5Hpru7aXQin10OUhm2GvYKVoYH2H8Gn0b5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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