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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaaf907dc5ee3eb6026f3e52ae1b070443e7aa335a5d76da87574a87cf0ee639' 
  AND token = 'QJOYK1YX4ffzvnTpf0A7BsfEJgf6x+KMHfTf5MQ3LYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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