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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '125a08342dd0c0d3db9c9c579cdff8ad5e3305f940aa8376cc6f4cf556684e6c' 
  AND token = 'we1DcW0sPsr53fDDVjP524Z8BstvYrToDBPjUDJ9eFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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