Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5d43366c8ea8de56881732c6a4b91be7e0ebb971c34a3e5c2de7a37dfcc0e6b' 
  AND token = 'csV62w9S/+gR5CM3P5/nUk4kTYVsrRK4r1BSP/aDqb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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