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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9784e07e7194cc6715ad25889c10a3b9125d3be4aef83b81602d37d349efdeb9' 
  AND token = 'EwzERYyha8f1en46JPfl0ON+129JlKeLYOrayXOBZJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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