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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '395293dd7a708d2c89fb073fc5eb31a60d327248e012afce6efb32f06a0d48f8' 
  AND token = 'v5K0+Zc0yCPk3RYDlp4M3ngAWPNMmduJcxnokpkR++U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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