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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a467e67a3e336c3d9e2e69fcc4d602fa82b5ad9f7753f37c6bca546eaf5d568b' 
  AND token = 'N/lQadd+f60x3H99LkiBLvdbufSdsZTGc2Ga6R+NVz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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