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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae713bedf6e3b2aeeb8f35e768825276c497f6755dcdb8143a28edb179699a79' 
  AND token = 'Mw0gcnWBzeT0TxP14nRqyDXBYKcr0LvzER7uTU9U5Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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