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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd16b033480c2c783475b77363212b0da6fbba753cd664b4d67d0bc7d4f83b3b3' 
  AND token = 'VPhqc4uSFr1unso7tOZ4r3LKOkjxyr8LkhdIhhp0fdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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