Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a75b3799074f4b129fa3a196aaf446fe16d47ab6907600b69c995bf0016dd8bc' 
  AND token = 'b9qJaQns2iHyp8QCD0ddpdnxs+CmpAttSpUrsljlD3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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