SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '662c493d723418251776583bafe47f3912dba8d3767ba92d57b871bc01558d2f' 
  AND token = 'eV0qTdTcnuWqWustHyNa5AqOoIZGQCnyQjS4NCBU/Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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