SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a3ec14ed2a8159796dc946d477d7a38af8f406416c5f4a47d302508b4a8cf05' 
  AND token = 'KZZ99OnkJMvICL9Fl+QXccELqp2Fhsiqta4pY8CIr/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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