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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f6b4afdf33804365ad1ba62781f31be108d0e8e8c8d57c560a54c4e7c55a900' 
  AND token = 'NsREUlbvjy1cGA7A+wH9e8JeQ4fdaXieaM33gl89Zzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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