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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cc6b98d2b2f1e55f1fd27d5067d5eea220f8589e2d1a5c5928f916b0de4f900' 
  AND token = 'CZI9HQn4cqyGttaHEGJo6jZGbOupjQNNyCg+4pO1SVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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