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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3569ca7898e6769a9dabcc1ac8b2ce5dec4fbcc748647a57a3cba775a5e23c25' 
  AND token = '3fbXYkLx1SR/8NI/YblBU2D23dT92saQu7UZ1orXbDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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