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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4103e4b1c994038f9e4283ade3d484951a8b6c064ddfc954c4961cd90e9bdff' 
  AND token = 'x6VNK/7HlNFypsr+hcRrIaF93Ss5OL0vIQIhW5MXXwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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