SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4638f168f73bf71af789850aae38953ffd87c8a3e00128d7236b87e45fc6ab2' 
  AND token = 'P6rmqTs+cvCuzaDLVKNrg2wEGkq2Mc9Fb26GqBF4QLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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