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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a714a6ff8f626cc532ee6ad36571599c979ce62287274a54da3423908a20d97e' 
  AND token = 'gVRkMA1AnyjJZKlupN8X7XAyEzFK12ZodMaloSjDlDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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