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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91d2796c7f6bd14bb690f1b44a33a847ae62ac084dcd57a67f2693b7d9482ba1' 
  AND token = 'oTXK2Zp9ByE7nFDrjW7lXTosX7ndabpJsrHG7vemMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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