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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '610c208292475a89da4f201c11dcb81c822813ae2525093968df6c90272d07ae' 
  AND token = 'gPu8pkGpYGyMKGWh9J08kR6DOTbvfvO7OTGGTDuTocg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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