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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aee04eef934e59fea58c61305cded16c621fae8ee5868010536d05e4b0980ae3' 
  AND token = '8UwjBwvQB3gJ2FuiJAPut504tLDf67n/pPg5ikXFpA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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