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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e074a33a4578b339804d7e1139f36903fd4e6ca9569bbb5f1e88ad7957b57e99' 
  AND token = 'gcePZ80+GJ9NWZbE2aoGjUizwH0UCiH9N6xQRbkjouM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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