SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46a415a9dd885432bb8ae783ad0a925e273c58133306b75839e2f50105fbb664' 
  AND token = '6Bv0MGoGlzZfSbBqA3V8eWGe+HLa8Vz0xhMSsIVj0Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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