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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb712cfd0efeb413ce563f14c3e81fde592d6dd5fc399edfa3ea5da930ee2fe7' 
  AND token = 'vJODYGHGHkRjeAqOyVY9uVAzUOEbi1iwSRUEVgPDGsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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