SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcde82a53404657fefd113a6b841308f5552933ba46c8c91bc9d01e7b4b6177a' 
  AND token = 'qLajRG3Kc4drngKVWiPNBgnmCZvWrDscUADBUrXbxas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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