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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a964a5340237f7ca5de2ff625940bd2fe5a88946ca8c98ae3588f2f33533c403' 
  AND token = 'MxwgC3ACYHFAi5jPwVR5R8udresia/UbjMB5Wd2XM/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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