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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '618930991c17911baa03adccdee1764ea50be0162a7811852ff3ec59b056c04b' 
  AND token = 'E4Aa0BJLA1j8MdVo8im0n8x4ATYtC7WL8kMKvgDu9dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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