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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41c22836f558c4b4f85e62b0fbff445b9c5bc54bffc87dc599b5277dc3736fde' 
  AND token = 'wtlNDZWEDCQSOD3u0U2ykpEITif0/Pt1k6XMy8fpogA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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