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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '717c1a31f384e3ba82400a9316e7e3d9973d97f6f0bf5bf7c76d5b7066a311c4' 
  AND token = 'vKF503e070Rhn/YQQHgWpWT9S69QlSmwuoR63ZzXu9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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