SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '824161c755531ecc4eb6899416d14b0488ff6990dad08c351d980ed7d69a34cf' 
  AND token = '+YW+aNrfQyp6SAU8u1z+kzel8CnBh1R3DwFjZCySZ+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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