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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a36e3a92984fdc88d6322548e9cab39aa8b43946c7b1f19c78ff16a5300ea93' 
  AND token = '2L96TJZN5an5y0ORYutfyGJbg3/g664JHlNjoUI9cjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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