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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '783129edabbec16322e6ae6ba4182457a1b54e184551350f98210be6c6978887' 
  AND token = 'v5U1bfV/8sI22OSOQC9G42sClAErrgwFipHBFi8wdDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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