SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54dae55a50805bcc16859b74ef924fb02257e3315bbd15dfc491e5d45f625ea6' 
  AND token = '+ylcqajSDYUBwpzz7Cr4FRh7dVlF/D+g3dWZb0ueDt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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