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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37ad3ff81691221c084679f5f971316eb7ae25645b99830143acc75e4eaac66a' 
  AND token = '2aE96tkx3evRw09sautHFjt6nLcIaQml5uUS8tRx+lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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