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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b57866bc1e2b10f9ee6e7609a212ee5a76724f3260a950053cd8bd72fa9388b' 
  AND token = 'ioeoGeEelmNeytb2h2h4pQl16/UKkWkzH5hMeqhBwPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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