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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '516c2ef38877c3c40f3bf1a7ffa3450f11a423ef4d86aeaa795c9b1d1274e1c0' 
  AND token = 'cAfsVvoqUi2FtyDIxP3AVkYadFJJrj1UaOY9P+p/HDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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