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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d0d4bba403d991e158ac3ff3fab699a3db3e8285ccdfd73028ac17e04056ae7' 
  AND token = '4OJvaOykiUxw4SoA2ieEG1fF3icB/NplWM6Sp9d69mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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