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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd252d50f8b3a2ec534d3f88947dfbaf26593d035014a76e00d6541ea179023b' 
  AND token = 'hmsapdbM8lXWrK0WXwH7cl0XhWxdqfAuWJpH2nYvspw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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