SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71d4294d5ad4bc8dbb3874ec7c63a14de74f3240ce8003802b3579e69593207c' 
  AND token = 'MjY7vLEnzbgGXcBZAmi8CQmm0pqrKyJ+NXDevsfyBIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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