SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c96970f752da7a63e0b81684e801efb359c82496a89955fd9ecfef098d50ff0' 
  AND token = '+qF3UZHKvfEn3lWohGSXKyjGjQxXye6Dr8q4Bw49SUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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