SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06c8fc3a3fc9b8920330473db6813df012fd9cbe7f765cc091d112f4b55203cb' 
  AND token = 'tFZsm4N2wMOB4BwVRLXTap/X/uG3BZC3ku5h+SV+J/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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