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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f337f99cfe2fc6466f4c0c74c008f8fafc6d51094c7ea2c168a8ac2ace4c7bc2' 
  AND token = 'VUJREvba37cqefjrwulWkLA3TW4N5pAqxUCLm1d/ggg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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