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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd27f0ab56eb7a6c7ce000e90f17dc489e7a9acc78da039795a1ecd07f1e69217' 
  AND token = '1Pg+V3rQJF6Ftsttuk8Y6Aeigc5Z/oPnneVSymeC2AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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