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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2287afd0e12e1f071ab9e5e33dae5431158211853a224ba5a7a2c926be260b5' 
  AND token = '3Zj+ktucz/S4XuaH8Y9xhOI74AjCPtRSXEYsSARnzDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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