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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bde678ddbcf971a7b02521a5aefdb8d0085cf033211cdc1f3d13729901c62f7' 
  AND token = 'Xq49RAl/aTLmDCUCNKRu05LNofhFMv3KtG+fVNeoUqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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