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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3beb93cd7686eefd8c0a89f718d4362ad21d3f804ad7f9ac6dbd28f7a86794e' 
  AND token = 'zo/TKBOkf+H1ERIfX1t9zM5ycIQVQSiKBtMUiCICMxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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