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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dd22207a3fd54c08872d358e72affebd2cfe6cfc243dbdab5f054b8f4a6c396' 
  AND token = 'piNKQf4hQoKBH65epuHxJFawdQHjPHL9FyI48Wdnsno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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