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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fb52ac351013ad3a1409c239745d5f826d05d2f2d3582159ba0f486b21d32b2' 
  AND token = 'm9dNDuAnXczx40hTylQu5t/cKgNHWmjoKnfgAq+441k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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