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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a7740751eafdb39501d275cc1dfd1badf9708e99aa47b51e17039618c4b216c' 
  AND token = '2LLa4H/AMeBpdG490XgTY9+99OcZxugUhUhce0BElD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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