Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12381c578cff40e4533987dab440698445382992ee59ec20079257ac84555b32' 
  AND token = 'GmMx2o3t+0x6D1r4TPhTptZissvwL/eVVyjPZZL2oM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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