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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af54777834ed407c23c8dd059d050f5278a8a4cb6c960594b58e4929a3a69f57' 
  AND token = 'ZCa3WEG0m5J6PZtKl++JUQRNuGL6g10UlZ62PHWd9JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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