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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4a839af6a81e6f3774c1b094a3b466cdd140d89f0c09b013bf8af74cdc6d08a' 
  AND token = 'CXrolKXtmQDSvvUBpb7zyd1dSYZPql4qxosKheeIvPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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